Cooling tower having thermally managed motor

ABSTRACT

The present invention is directed to a cooling tower that has a cooling tower structure having fill material supported by the cooling tower structure and configured to receive heated process fluid and a motor mounted to the cooling tower structure. The motor has a casing and a rotatable shaft and is sealed to prevent fluids, moisture, foreign particles and contaminants from entering the casing. A fan is connected to the rotatable shaft of the motor. Rotation of the rotatable shaft rotates the fan thereby inducing an upward moving mass flow of cool air through the fill material. A basin is attached to the cooling tower structure for collecting cooled fluid. A fluid distribution system distributes the cooled fluid in the basin. The fluid distribution system has a pumping device to pump cooled fluid from the basin, fluid piping to receive the pumped cooled fluid and fluid spray devices fluidly connected to the fluid piping for spraying fluid on the casing of the motor so as to transfer heat of the casing to the fluid.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a divisional application of U.S. application Ser. No.15/327,864, filed Jan. 20, 2017, now U.S. Pat. No. 10,320,266, which wasthe National Stage of International Application No. PCT/US2015/041312,filed Jul. 21, 2015, which claimed the benefit of U.S. application No.62/027,100, filed Jul. 21, 2014 and to U.S. application No. 62/049,105,filed Sep. 11, 2014. The entire disclosures of U.S. application Nos.62/027,100, 62/049,105, and Ser. No. 15/327,864 are hereby incorporatedby reference. International Application No. PCT/US2015/041312 and theentire disclosure thereof are hereby incorporated by reference.

TECHNICAL FIELD

The present invention is directed to cooling towers that have thermallymanaged motors.

BACKGROUND ART

Wet cooling towers that have direct-drive fan systems utilize a motorthat directly drives the cooling tower fan. During operation of suchmotors, excessive heat may be generated in the stator windings, rotor,casing or other portions of the motor. In order to prevent suchexcessive heat from damaging the motor, reducing its performance orshortening its operational life, it is necessary to remove orsignificantly reduce such heat. On the other hand, in extremely coldconditions, it may be necessary to increase the temperature of the motorin order to prevent the motor from freezing.

What is needed is an improved cooling tower wherein the cooling towermotor can be thermally managed depending upon the operational andenvironmental conditions under which the motor operates. It is essentialthat the aforesaid improved cooling tower does not utilize any auxiliaryequipment that will increase the weight and cost of the cooling tower.

DISCLOSURE OF THE INVENTION

A cooling tower motor will have a preferred range of operatingtemperatures for best efficiency based on outside environmentalconditions (e.g. temperature, wind, etc.), process conditions (e.g.water temperature, flow, etc.) and motor operating speed (e.g. internaltemperature, etc.). Therefore, temperature is a significant factor thathas an effect on sealing, rotor-to-stator clearance, motor volumechanges, etc. Thus, an object of the invention is not only to cool orheat the motor, but to maintain a temperature that provides the bestoperating efficiency for the motor.

In some embodiments, the present invention is directed to cooling towershaving fluid-cooled direct-drive motors. An important feature of thecooling tower embodiments disclosed herein is the utilization of asealed, direct-drive motor. Since the direct-drive motor is sealed,foreign particles, contaminants, fluid and moisture cannot enter themotor housing or casing. The cooling tower is configured so thatexisting cooling tower fluid is applied to the exterior surface of themotor casing in order to achieve a transfer of heat from the motorcasing to the fluid thereby substantially reducing or removing the heatfrom the casing. The present invention avoids the use of relativelyheavy, complex and expensive auxiliary cooling devices in the wetcooling tower.

In some embodiments, the present invention is directed to a coolingtower comprising a cooling tower structure comprising a fan deck, fillmaterial supported by the cooling tower structure and configured toreceive heated process fluid and a motor secured or mounted to the fandeck. The motor comprises a casing or housing and a rotatable shaft. Themotor is sealed to prevent fluids, moisture, foreign particles andcontaminants from entering the casing. The wet cooling tower furthercomprises a fan connected to the rotatable shaft of the motor. Rotationof the rotatable shaft rotates the fan thereby inducing an upward movingmass flow of cool air through the fill material. A basin is attached ormounted to the cooling tower structure for collecting cooled fluid. Thewet cooling tower further comprises a fluid distribution system todistribute the cooled fluid collected in the basin. The fluiddistribution system comprises a pumping device to pump cooled fluid fromthe basin, fluid piping to receive the pumped cooled fluid and at leastone fluid spray device fluidly connected to the fluid piping forspraying fluid on the casing of the motor so as to cause a transfer ofheat from the casing to the fluid. In a preferred embodiment, the fluiddistribution system comprises a plurality of fluid spray devices fluidlyconnected to the fluid pipes. In a preferred embodiment, each fluidspray device is configured to emit a mist of fluid in order to achievemaximum coverage of the motor casing.

Other embodiments of the present invention are also described herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevational view illustrating a portion of a coolingtower in accordance with one embodiment of the present invention,wherein the cooling tower utilizes spray devices positioned beside thecooling tower motor for spraying fluid on the motor casing, the view notshowing the fan stack of the cooling tower or a complete view of thecooling tower fan in order to simplify the drawing;

FIG. 2 is a side elevational view illustrating a cooling tower inaccordance with another embodiment of the present invention, wherein thecooling tower motor is positioned in the fluid in the basin; and

FIG. 3 is a side elevational view illustrating a cooling tower inaccordance with a further embodiment of the present invention, whereinthe cooling tower motor is positioned between sections of cooling towerfill material and beneath fluid spray devices that spray fluid on themotor casing.

BEST MODE FOR CARRYING OUT THE INVENTION

Wet cooling towers are described in U.S. Pat. No. 8,111,028 entitled“Integrated Fan Drive System For Cooling Tower” and internationalapplication no. PCT/US2012/061244 entitled “Direct Drive Fan System WithVariable Process Control” and published under International PublicationNo. WO 2013/059764. The entire disclosure of U.S. Pat. No. 8,111,028 ishereby incorporated by reference. The entire disclosure of internationalapplication no. PCT/US2012/061244 is hereby incorporated by reference.

As used herein, the term “fluid” includes water, either pure or withchemical and/or organic additives, and any other fluid that is suitablefor application to the motor casing in order to cool the motor.

As used herein, the terms “casing” and “housing” have the same meaningand are used interchangeably.

As used herein, the term “process” means an industrial process such as apetroleum refinery, power plant, turbine, crude cracker, fertilizerplant, glass manufacturing plant, chemical plant, etc.

As used herein, the terms “process fluid” or “process liquids” shallmean fluids or liquids, such as water, coolant or a combination thereof,used for cooling purposes in the “process”.

Referring to FIG. 1, there is shown wet cooling tower 10 in accordancewith one embodiment of the invention. Wet cooling tower 10 comprisescooling tower structure 12. Cooling tower structure 12 comprises fandeck 14. Sealed, variable speed, load bearing electric motor 16 issecured to fan deck 14. Motor 16 comprises casing or housing 18, astator within the casing (not shown), a rotor within the casing (notshown) and rotatable shaft 20 that is attached to the rotor. Since motor16 is sealed, foreign particles, contaminants and moisture cannot entermotor casing 18. In one embodiment, sealed motor 16 is configured as thesealed permanent magnet motor described in the aforementionedInternational Application No. PCT/US2012/061244. Fill material (notshown) is supported by cooling tower structure 12 and is configured toreceive heated process fluid that was used in a process, e.g. crackingcrude, etc. The fill material is not shown FIG. 1 but it is shown in theembodiments of FIGS. 2 and 3. The use of the fill material is well knownin the industry and is therefore not discussed in detail herein. Wetcooling tower 10 further comprises fan 26. Fan 26 has fan hub 28 whichis connected to rotatable shaft 20. Rotation of rotatable shaft 20rotates fan 26 thereby inducing an upward moving mass flow of cool airthrough the fill material. Wet cooling tower 10 further comprises abasin for collecting cooled fluid. The basin is not shown in FIG. 1 butis shown in the embodiments of FIGS. 2 and 3. Wet cooling tower 10includes fluid distribution system 24 that contains pressurized coolingfluid. This cooling fluid has already been evaporated and cooled and ispumped from the basin and through fluid distribution system 24. Fluiddistribution system 24 includes fluid pipes 30 and 32 that arepositioned in proximity to motor 16. As shown in FIG. 1, fluid pipes 30and 32 are positioned at different locations around motor 16. Fluidpipes 30 and 32 are substantially vertical oriented. However, fluidpipes 30 and 32 can be angulated if available space is limited. AlthoughFIG. 1 shows two fluid pipes 30 and 32, it is to be understood thatthere can be more or less than two fluid pipes. When a plurality offluid pipes are used, it is preferred that the fluid pipes areequidistantly space about motor 16. Fluid distribution system 24includes pumping device 35 and fluid pipe 36. Fluid pipe 36 extends downinto the fluid in the basin. Pumping device 35 pumps cooled fluid fromthe basin into the piping of fluid distribution system 24, includingfluid pipes 30 and 32. Fluid distribution system 24 further comprises atleast one fluid spray device 40 that is fluidly connected to fluid pipe30. Preferably, there is a plurality of fluid spray devices 40 that arefluidly connected to fluid pipe 30. In one embodiment, each fluid spraydevice 40 is configured as a spray nozzle. Similarly, fluid distributionsystem 24 further comprises at least one fluid spray device 50 that isfluidly connected to fluid pipe 32. Preferably, there is a plurality offluid spray devices 50 that are fluidly connected to fluid pipe 32. Inone embodiment, each fluid spray device 50 is configured as a spraynozzle. Fluid spray devices 40 and 50 are configured to spray fluid 60(e.g. water) on casing 18 of motor 16 to cause a transfer of heat fromcasing 18 to the fluid. In a preferred embodiment, fluid spray devices40 and 50 are configured to emit a fluid mist in order to limit theforce of the fluid and to maximize motor surface coverage.

In one embodiment, the water that is applied to the motor casing istapped from the existing cooling tower header carrying the hot processfluid.

In one embodiment, fluid spray devices 40 and 50 are continuouslyspraying fluid on motor 16. In an alternate embodiment, an electricvalve network is used that allows fluid spray devices 40 and 50 to sprayfluid on motor 16 only when the temperature of motor casing 18 exceeds athreshold temperature. In such an embodiment, moisture and corrosionproof temperature sensors are mounted to the exterior of motor casing18. An electric valve controls the flow of fluids to fluid pipes 30 and32 and is electrically connected to the temperature sensors. Theelectric valve is closed when the temperature sensors indicate thetemperature of the motor casing 18 is below the threshold. When thetemperature of the motor casing 18 exceeds the threshold, thetemperature sensor outputs a signal which causes the electric valve toopen so as to allow fluid spray devices 40 and 50 to spray fluid onmotor 16. Temperature sensors may also be used within the interior ofcasing 18. Suitable external and internal temperature sensors aredescribed in the aforementioned International Application No.PCT/US2012/061244.

In one embodiment, wet cooling tower 10 comprises a fan stack (notshown) that is connected to the fan deck. The fan rotates within the fanstack. The fan stack is not shown in FIG. 1 but a fan stack is shown inthe embodiments of FIGS. 2 and 3. In another embodiment, wet coolingtower 10 does not use a fan stack but instead, uses a fan cylinder (notshown) which is connected to the fan deck. In such an embodiment, thefan rotates within the fan cylinder. The function and purpose of fanstacks and fan cylinders are well known in the industry and aretherefore not described in detail.

In an alternate embodiment, a fluid spray bar is attached to fan hub 28and fluid is provided to the fluid spray bar with a rotating union orsimilar device in order to create a rotating spray bar system. Fluidsdischarged from the rotating spray bar system eventually seep back intothe basin. In one embodiment, this fluid spray bar is attached to thebottom of the fan hub 28.

In an alternate embodiment, air and fluid are emitted through the spraybars. Such a configuration can be combined with vortex or vortec coolersand separate blower systems.

In another embodiment, cooled fluid in the basin is pumped into thefluid pipes 30 and 32, or into spray bar 302 (see FIG. 3).

In an alternate embodiment, a mixing valve and temperature sensors areused to mix hot process fluid and cooled basin fluid accordingly.Alternately, a third fluid stream is provided to make up the requiredtemperature differential.

In alternate embodiments, heaters and heat exchangers are used to obtainthe desired temperature of the fluid that will be used to cool themotor.

In an alternate embodiment, hot process water is pumped into the fluidpipes 30 and 32, or spray bar 302 (see FIG. 3) to prevent the motor fromfreezing in cold temperature.

Referring to FIG. 2, there is shown wet cooling tower 100 in accordancewith another embodiment of the invention. Wet cooling tower 100comprises cooling tower structure 102. Cooling tower structure 102comprises fan deck 104, fan stack 105 and basin 130. Fan stack 105 isconnected or mounted to fan deck 104. Wet cooling tower 100 furthercomprises sealed, load bearing electric motor 106 that is positionedwithin basin 130. Motor 106 comprises casing or housing 108, a statorwithin the casing (not shown), a rotor within the casing (not shown) androtatable shaft 110 that is attached to the rotor. Since motor 106 issealed, fluids, foreign particles, contaminants and moisture cannotenter motor casing 108. In one embodiment, sealed motor 106 isconfigured as the sealed, permanent magnet motor described in theaforementioned International Application No. PCT/US2012/061244. As shownin FIG. 2, fluid 132 in basin 130 covers a substantial portion of motorcasing 108. Since motor 106 is sealed, motor 106 can be totallysubmerged in fluid 132. Substantially all of the heat of motor casing108 is transferred to fluid 132.

Fill material 120 is supported by cooling tower structure 102. Coolingtower fluid distribution system 122 extends through fill material 120 todistribute fluid to the fill material 120. Wet cooling tower 100 furthercomprises fan 124 which has fan hub 126. Cooling tower structure 102includes structural members 150, 152, 154, 156, 157 and 158. The fan 126is supported by structural members 150, 152, 154, 156, 157 and 158, andbearings 160 and 162. Therefore, motor 106 does not support the fanloads. Coupling 170 couples the rotatable shaft 110 to an extended driveshaft 172. The extended drive shaft 172 is connected to fan hub 126.Rotation of rotatable shaft 110 rotates drive shaft 172 and fan 126.Rotation of fan 126 induces an upward moving, mass flow of cool airthrough fill material 120.

In an alternate embodiment, an electric valve and temperature sensors,as described with respect to the embodiment of FIG. 1, may also be usedwith motor 106.

Referring to FIG. 3, there is shown wet cooling tower 200 in accordancewith another embodiment of the invention. Wet cooling tower 200comprises cooling tower structure 202. Cooling tower structure 202comprises fan deck 204 and fan stack 205 which is attached to fan deck204. Cooling tower structure 202 further comprises horizontal structuralmember 212. Sealed, variable speed, load bearing, electric motor 206 issecured or mounted to horizontal structural member 212. Motor 206comprises casing or housing 208, a stator within the casing (not shown),a rotor within the casing (not shown) and rotatable shaft 210 that isattached to the rotor. Since motor 206 is sealed, foreign particles,contaminants, fluids and moisture cannot enter motor casing 208. In oneembodiment, sealed motor 206 is configured as the sealed permanentmagnet motor described in the aforementioned International ApplicationNo. PCT/US2012/061244. Cooling tower 200 includes fill material which iscomprised of fill material sections 210A and 210B. Fill materialsections 210A and 210B are supported by cooling tower structure 202.Motor 206 is positioned between fill material sections 210A and 210B.Wet cooling tower 200 further comprises fan 216. Fan 216 has fan hub 218and rotates within fan stack 205. Cooling tower structure 202 includesstructural members 220 and 222. Fan 216 is supported by structuralmembers 220 and 222, and bearings 230 and 232. Thus, motor 206 does notsupport the fan loads. Coupling 240 couples the rotatable shaft 210 toan extended drive shaft 242. The extended drive shaft 242 is connectedto fan hub 218. Therefore, rotation of rotatable shaft 210 rotates driveshaft 242 which causes rotation of fan 216. Rotation of fan 216 inducesan upward moving mass flow of cool air through fill material sections210A and 210B. Wet cooling tower 200 further comprises basin 250 forcollecting cooled fluid 252. Wet cooling tower 200 further comprisesdrift eliminator 260 which is attached to cooling tower structure 202and positioned over motor 206 and fill material sections 210A and 210B.Drift eliminators are well known in the art and are therefore notdiscussed herein.

Wet cooling tower 200 includes fluid distribution system 300 thatcontains pressurized cooling water. This cooling water has already beenevaporated and cooled and is pumped from the basin and through fluiddistribution system 300 with a pumping device similar to pumping device35 shown in FIG. 1. Fluid distribution system 300 includes cooling towerspray bar 302 which is supported by cooling tower structure 202 andpositioned over motor 206 and fill material sections 210A and 210B. Inone embodiment, cooling tower spray-bar 302 is part of the existingcooling tower fluid distribution system. Fluid distribution system 300further comprises a plurality of fluid spray devices or nozzles 310 thatare fluidly connected to cooling tower spray bar 206. Fluid spraydevices 310 are configured to spray fluid on motor casing 208 to cause atransfer of heat from motor casing 208 to the fluid. In a preferredembodiment, fluid spray devices 310 are configured to emit a fluid mistin order to limit the force of the fluid and to maximize motor surfacecoverage.

In an alternate embodiment, cooling tower structure 202 has a fancylinder instead of fan stack 205.

In an alternate embodiment, the embodiments of FIGS. 1 and 3 arecombined so that fluid is sprayed on the motor from above and from thesides.

The foregoing embodiments of the invention may be implemented andrealized regardless of the orientation of the cooling fan. This meansthat the embodiments of the invention may be implemented and realizedwhether the cooling tower fan is above the motor or below the motor.Furthermore, the foregoing embodiments of the invention may beimplemented and realized regardless of the direction of airflow in thecooling tower.

In a preferred embodiment, motors 16, 106 and 206 have the bearing andseal configuration that is described in the aforementioned internationalapplication no. PCT/US2012/061244. As a result of this novel bearing andseal design, motors 16, 106 and 206 do not require oil-bath lubricationunlike prior art gearboxes. As a result, motors 16, 106 and 206 can bearranged in any orientation, e.g. horizontal, vertical, motor shaftdown, motor shaft up, angular, etc.

In the case of dry cooling towers, such as the type described in U.S.Pat. No. 8,188,698, water can be pumped to the dry cooling tower for usein cooling the motor. In such an embodiment, water delivery devices canbe positioned above the motor and/or around the motor.

In other embodiments, compressed air is used instead of water to coolthe motor. In such an embodiment, a compressed air source is locatedoutside of the fan stack. Compressed air is suitable for cooling orheating motors used in dry cooling towers such as the type disclosed inthe aforementioned U.S. Pat. No. 8,188,698.

In such an embodiment, compressed air conduits are routed from thecompressed air source to the tower and arranged so that compressed aircan be discharged on the motor from any angle.

In a further embodiment, pressurized hot water that is returned from theprocess is combined with pressurized cooler water from the basin feed tothe process so as to provide a suitable temperature via mixing valvesand thermostats. Alternatively, a third make-up water source can be usedas required to make up the required temperature differential so as toprovide a suitable temperature to the motor (hot or cold) to maintainoptimum motor efficiency through various environmental conditions andprocess loads.

The cooling tower systems disclosed herein can be used with orcontrolled by the control systems disclosed in the aforementionedinternational application no. PCT/US2012/061244 entitled “Direct DriveFan System With Variable Process Control”.

The present invention may be implemented regardless of the orientationof the cooling tower motor or fan. Thus, the invention may be applied tocooling towers wherein the motor is above or below the fan or if themotor is positioned right side up (shaft up) or upside down (shaftdown). The invention can be applied to wet cooling towers, dry coolingtowers and mechanical towers. Since motors 16, 106 and 216 are sealed,the motor can be in any position or orientation.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. However, theillustrative discussions above are not intended to be exhaustive or tolimit the invention to the precise forms disclosed. Many modificationsand variations are possible in view of the above teachings. Theembodiments were chosen and described in order to best explain theprinciples of the invention and its practical applications, to therebyenable others skilled in the art to best utilize the invention andvarious embodiments with various modifications as are suited to theparticular use contemplated

What is claimed is:
 1. A cooling tower comprising: a cooling towerstructure; fill material supported by the cooling tower structure andconfigured to receive heated process fluid; a motor mounted to thecooling tower structure, the motor comprising a casing and a rotatableshaft, the casing having an exterior surface and an interior, the motorbeing sealed to prevent fluids, moisture, foreign particles andcontaminants from entering the casing, the motor further comprising atleast one temperature sensor for outputting sensor signals thatrepresent temperature; a fan connected to the rotatable shaft of themotor, wherein rotation of the rotatable shaft rotates the fan therebyinducing an upward moving mass flow of cool air through the fillmaterial; a basin attached to the cooling tower structure for collectingcooled fluid; a temperature-controlled fluid distribution system todistribute cooled fluid from the basin onto the motor to cause atransfer of heat from the casing of the motor to the fluid, thetemperature-controlled fluid distribution system being responsive to thesensor signals and configured to distribute cooled fluid from the basinonto the motor when the sensor signals indicate a temperature thatexceeds a predetermined threshold and to cease distributing the cooledfluid onto the motor when the sensor signals indicate a temperature thatis below the predetermined threshold.
 2. The cooling tower according toclaim 1 wherein the temperature-controlled fluid distribution systemcomprises a pump for pumping cooled fluid from the basin.
 3. The coolingtower according to claim 2 wherein the fluid distribution system furthercomprises: fluid piping to receive the cooled fluid pumped from thebasin; an electric valve having a signal input to receive the sensorsignals and being fluidly connected to the fluid piping; at least onefluid spray device fluidly connected to the electric valve andconfigured to spray fluid on the casing of the motor; and wherein theelectric valve is configurable to a closed state to prevent flow offluid therethrough when the sensor signals indicate a temperature thatis below a predetermined threshold and to an open state that allowsfluid to flow therethrough to the at least one spray device when thesensor signals indicate a temperature that exceeds the predeterminedthreshold.
 4. The cooling tower according to claim 1 wherein the atleast one temperature sensor is attached to the exterior surface of thecasing.
 5. The cooling tower according to claim 1 wherein the at leastone temperature sensor is within the interior of the casing.
 6. Thecooling tower according to claim 1 wherein the cooling tower fan isabove the motor.
 7. The cooling tower according to claim 1 wherein thecooling tower fan is below the motor.
 8. The cooling tower according toclaim 1 wherein the cooling tower structure further comprises a fanstack, wherein the fan rotates within the fan stack.
 9. The coolingtower according to claim 1 wherein the cooling tower further comprises afan cylinder, wherein the fan rotates within the fan cylinder.
 10. Thecooling tower according to claim 1 wherein the at least one fluid spraydevice comprises a spray nozzle.
 11. The cooling tower according toclaim 1 wherein the at least one fluid spray device is located besidethe motor.
 12. The cooling tower according to claim 1 wherein the fillmaterial comprises two sections and wherein the motor is positionedbetween the two sections of fill material.
 13. A cooling towercomprising: a cooling tower structure; a basin attached to the coolingtower structure for collecting cooled fluid; a variable speed, loadbearing electric motor secured to the cooling tower structure, the motorcomprising a casing having an exterior surface and an interior, themotor further comprising a stator and rotor within the interior of thecasing and a rotatable shaft attached to the rotor, the motor beingsealed to prevent fluids, moisture, contaminants and foreign particlesfrom entering the interior of the casing; a first fill material sectionsupported by the cooling tower structure; a second fill material sectionsupported by the cooling tower structure, wherein the first fillmaterial section and the second fill material section are arranged suchthat the motor is positioned between the first material fill section andsecond material fill section; a fan support structure attached to thecooling tower structure; a bearing system mechanically coupled to thefan support structure and having a plurality of bearings; a coolingtower fan supported by the fan support structure and the plurality ofbearings; a drive shaft mechanically coupled to the rotatable shaft ofthe motor and extending through the fan support structure and attachedto the cooling tower fan, wherein rotation of the rotatable shaftrotates the drive shaft which causes rotation of the cooling tower fanand wherein rotation of the cooling tower fan induces an upward movingmass flow of cool air through the first fill material section and thesecond fill material section; and a fluid distribution system todistribute cooled fluid from the basin onto the casing of the motor tocause a transfer of heat from the casing to the fluid.
 14. The coolingtower according to claim 13 further wherein the fluid distributionsystem comprises a pump for pumping cooled fluid from the basin.
 15. Thecooling tower according to claim 14 wherein the fluid distributionsystem further comprises a spray bar fluidly connected to the pump andpositioned over the motor and the first fill material section and thesecond fill material section, the spray bar being configured to directfluid from the pump onto the casing of the motor.
 16. The cooling toweraccording to claim 15 wherein the spray bar includes a plurality ofspray devices configured to spray fluid onto the casing of the motor.17. The cooling tower according to claim 15 wherein the spray barincludes a plurality of spray devices configured to emit a fluid mist.18. The cooling tower according to claim 13 wherein the cooling towerstructure includes a horizontal support member and wherein the motor ismounted to the horizontal support member and the first fill materialsection and second fill material section are supported by the horizontalsupport member.
 19. The cooling tower according to claim 13 wherein thecooling tower structure comprises a fan deck.
 20. The cooling toweraccording to claim 19 further comprising a fan stack that is attached tothe fan deck, wherein the fan rotates within the fan stack.